hive_sh4re::Request uses #[serde(tag = "cmd")] so Wake serialises as
{"cmd":"wake",...}. The wake.rs in hive-matrix-mcp was sending
{"kind":"wake",...} — the harness could not deserialise the message
and silently discarded every incoming matrix event.
Also: drain the server's response line instead of just shutting the
write half. Without the drain the server got ECONNRESET writing back,
which logged a spurious error even though the wake itself was now
processed.
Root cause of the matrix notification blackhole reported in #1087.
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